Kamen Rider Decade is the latest Kamen Rider series. This series is very different, as it's a kind of anniversary series, tying together some of the past Kamen Rider series.
Like the show Quantum Leap, Kadoya Tsukasa (門矢 士 Kadoya Tsukasa, portrayed by Masahiro Inoue) passes from different dimensions solving problems from each different Kamen Rider world. He gains allies, like Kamen Rider Kuuga, who have joined his journey.
In the background of all this, Decade is also being foretold that he is actually the Destroyer of Wolrds. Hikari Natsumi, his female companion on this adventure, has seen visions of a great Rider War, where Decade is the only one left standing. So, will Decade Destroy everything, or connect everything?
This is a fun series, and probably can be even more appreciated by longtime Kamen Rider fans. I only have the two previous series on my viewing resume, but so far the series seems very loose with continuity, so new time fans won't be confused. When visiting Kamen Rider Kiva's world, for instance, Wataru was actually a young boy instead of a young man. The worlds are all being mixed together, so alterations in the different histories work well enough. Essentially, you don't have to feel intimidated, thinking you need to know everything about Kamen Rider. If you don't, this show simply becomes a wild ride - which is fun in of it's self. And along the way you might learn a bit about all the cool past Kamen Rider series.
Anyway, here are some images from Kamen Rider Decade. Note all the different Kamen Riders - all of who Decade will eventually be able to imitate and use their abilities.